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[apple/icu.git] / icuSources / layout / IndicReordering.cpp
1 /*
2 / *
3 * (C) Copyright IBM Corp. 1998-2012 - All Rights Reserved
4 *
5 */
6
7 #include "LETypes.h"
8 #include "OpenTypeTables.h"
9 #include "OpenTypeUtilities.h"
10 #include "IndicReordering.h"
11 #include "LEGlyphStorage.h"
12 #include "MPreFixups.h"
13
14 U_NAMESPACE_BEGIN
15
16 #define loclFeatureTag LE_LOCL_FEATURE_TAG
17 #define initFeatureTag LE_INIT_FEATURE_TAG
18 #define nuktFeatureTag LE_NUKT_FEATURE_TAG
19 #define akhnFeatureTag LE_AKHN_FEATURE_TAG
20 #define rphfFeatureTag LE_RPHF_FEATURE_TAG
21 #define rkrfFeatureTag LE_RKRF_FEATURE_TAG
22 #define blwfFeatureTag LE_BLWF_FEATURE_TAG
23 #define halfFeatureTag LE_HALF_FEATURE_TAG
24 #define pstfFeatureTag LE_PSTF_FEATURE_TAG
25 #define vatuFeatureTag LE_VATU_FEATURE_TAG
26 #define presFeatureTag LE_PRES_FEATURE_TAG
27 #define blwsFeatureTag LE_BLWS_FEATURE_TAG
28 #define abvsFeatureTag LE_ABVS_FEATURE_TAG
29 #define pstsFeatureTag LE_PSTS_FEATURE_TAG
30 #define halnFeatureTag LE_HALN_FEATURE_TAG
31 #define cjctFeatureTag LE_CJCT_FEATURE_TAG
32 #define blwmFeatureTag LE_BLWM_FEATURE_TAG
33 #define abvmFeatureTag LE_ABVM_FEATURE_TAG
34 #define distFeatureTag LE_DIST_FEATURE_TAG
35 #define caltFeatureTag LE_CALT_FEATURE_TAG
36 #define kernFeatureTag LE_KERN_FEATURE_TAG
37
38 #define loclFeatureMask 0x80000000UL
39 #define rphfFeatureMask 0x40000000UL
40 #define blwfFeatureMask 0x20000000UL
41 #define halfFeatureMask 0x10000000UL
42 #define pstfFeatureMask 0x08000000UL
43 #define nuktFeatureMask 0x04000000UL
44 #define akhnFeatureMask 0x02000000UL
45 #define vatuFeatureMask 0x01000000UL
46 #define presFeatureMask 0x00800000UL
47 #define blwsFeatureMask 0x00400000UL
48 #define abvsFeatureMask 0x00200000UL
49 #define pstsFeatureMask 0x00100000UL
50 #define halnFeatureMask 0x00080000UL
51 #define blwmFeatureMask 0x00040000UL
52 #define abvmFeatureMask 0x00020000UL
53 #define distFeatureMask 0x00010000UL
54 #define initFeatureMask 0x00008000UL
55 #define cjctFeatureMask 0x00004000UL
56 #define rkrfFeatureMask 0x00002000UL
57 #define caltFeatureMask 0x00001000UL
58 #define kernFeatureMask 0x00000800UL
59
60 // Syllable structure bits
61 #define baseConsonantMask 0x00000400UL
62 #define consonantMask 0x00000200UL
63 #define halfConsonantMask 0x00000100UL
64 #define rephConsonantMask 0x00000080UL
65 #define matraMask 0x00000040UL
66 #define vowelModifierMask 0x00000020UL
67 #define markPositionMask 0x00000018UL
68
69 #define postBasePosition 0x00000000UL
70 #define preBasePosition 0x00000008UL
71 #define aboveBasePosition 0x00000010UL
72 #define belowBasePosition 0x00000018UL
73
74 #define repositionedGlyphMask 0x00000002UL
75
76 #define basicShapingFormsMask ( loclFeatureMask | nuktFeatureMask | akhnFeatureMask | rkrfFeatureMask | blwfFeatureMask | halfFeatureMask | vatuFeatureMask | cjctFeatureMask )
77 #define positioningFormsMask ( kernFeatureMask | distFeatureMask | abvmFeatureMask | blwmFeatureMask )
78 #define presentationFormsMask ( presFeatureMask | abvsFeatureMask | blwsFeatureMask | pstsFeatureMask | halnFeatureMask | caltFeatureMask )
79
80
81 #define C_MALAYALAM_VOWEL_SIGN_U 0x0D41
82 #define C_DOTTED_CIRCLE 0x25CC
83 #define NO_GLYPH 0xFFFF
84
85 // Some level of debate as to the proper value for MAX_CONSONANTS_PER_SYLLABLE. Ticket 5588 states that 4
86 // is the magic number according to ISCII, but 5 seems to be the more consistent with XP.
87 #define MAX_CONSONANTS_PER_SYLLABLE 5
88
89 #define INDIC_BLOCK_SIZE 0x7F
90
91 class IndicReorderingOutput : public UMemory {
92 private:
93 le_int32 fSyllableCount;
94 le_int32 fOutIndex;
95 LEUnicode *fOutChars;
96
97 LEGlyphStorage &fGlyphStorage;
98
99 LEUnicode fMpre;
100 le_int32 fMpreIndex;
101
102 LEUnicode fMbelow;
103 le_int32 fMbelowIndex;
104
105 LEUnicode fMabove;
106 le_int32 fMaboveIndex;
107
108 LEUnicode fMpost;
109 le_int32 fMpostIndex;
110
111 LEUnicode fLengthMark;
112 le_int32 fLengthMarkIndex;
113
114 LEUnicode fAlLakuna;
115 le_int32 fAlLakunaIndex;
116
117 FeatureMask fMatraFeatures;
118
119 le_int32 fMPreOutIndex;
120 MPreFixups *fMPreFixups;
121
122 LEUnicode fVMabove;
123 LEUnicode fVMpost;
124 le_int32 fVMIndex;
125 FeatureMask fVMFeatures;
126
127 LEUnicode fSMabove;
128 LEUnicode fSMbelow;
129 le_int32 fSMIndex;
130 FeatureMask fSMFeatures;
131
132 LEUnicode fPreBaseConsonant;
133 LEUnicode fPreBaseVirama;
134 le_int32 fPBCIndex;
135 FeatureMask fPBCFeatures;
136
137 void saveMatra(LEUnicode matra, le_int32 matraIndex, IndicClassTable::CharClass matraClass)
138 {
139 // FIXME: check if already set, or if not a matra...
140 if (IndicClassTable::isLengthMark(matraClass)) {
141 fLengthMark = matra;
142 fLengthMarkIndex = matraIndex;
143 } else if (IndicClassTable::isAlLakuna(matraClass)) {
144 fAlLakuna = matra;
145 fAlLakunaIndex = matraIndex;
146 } else {
147 switch (matraClass & CF_POS_MASK) {
148 case CF_POS_BEFORE:
149 fMpre = matra;
150 fMpreIndex = matraIndex;
151 break;
152
153 case CF_POS_BELOW:
154 fMbelow = matra;
155 fMbelowIndex = matraIndex;
156 break;
157
158 case CF_POS_ABOVE:
159 fMabove = matra;
160 fMaboveIndex = matraIndex;
161 break;
162
163 case CF_POS_AFTER:
164 fMpost = matra;
165 fMpostIndex = matraIndex;
166 break;
167
168 default:
169 // can't get here...
170 break;
171 }
172 }
173 }
174
175 public:
176 IndicReorderingOutput(LEUnicode *outChars, LEGlyphStorage &glyphStorage, MPreFixups *mpreFixups)
177 : fSyllableCount(0), fOutIndex(0), fOutChars(outChars), fGlyphStorage(glyphStorage),
178 fMpre(0), fMpreIndex(0), fMbelow(0), fMbelowIndex(0), fMabove(0), fMaboveIndex(0),
179 fMpost(0), fMpostIndex(0), fLengthMark(0), fLengthMarkIndex(0), fAlLakuna(0), fAlLakunaIndex(0),
180 fMatraFeatures(0), fMPreOutIndex(-1), fMPreFixups(mpreFixups),
181 fVMabove(0), fVMpost(0), fVMIndex(0), fVMFeatures(0),
182 fSMabove(0), fSMbelow(0), fSMIndex(0), fSMFeatures(0),
183 fPreBaseConsonant(0), fPreBaseVirama(0), fPBCIndex(0), fPBCFeatures(0)
184 {
185 // nothing else to do...
186 }
187
188 ~IndicReorderingOutput()
189 {
190 // nothing to do here...
191 }
192
193 void reset()
194 {
195 fSyllableCount += 1;
196
197 fMpre = fMbelow = fMabove = fMpost = fLengthMark = fAlLakuna = 0;
198 fMPreOutIndex = -1;
199
200 fVMabove = fVMpost = 0;
201 fSMabove = fSMbelow = 0;
202
203 fPreBaseConsonant = fPreBaseVirama = 0;
204 }
205
206 void writeChar(LEUnicode ch, le_uint32 charIndex, FeatureMask charFeatures)
207 {
208 LEErrorCode success = LE_NO_ERROR;
209
210 fOutChars[fOutIndex] = ch;
211
212 fGlyphStorage.setCharIndex(fOutIndex, charIndex, success);
213 fGlyphStorage.setAuxData(fOutIndex, charFeatures | (fSyllableCount & LE_GLYPH_GROUP_MASK), success);
214
215 fOutIndex += 1;
216 }
217
218 void setFeatures ( le_uint32 charIndex, FeatureMask charFeatures)
219 {
220 LEErrorCode success = LE_NO_ERROR;
221
222 fGlyphStorage.setAuxData( charIndex, charFeatures, success );
223
224 }
225
226 FeatureMask getFeatures ( le_uint32 charIndex )
227 {
228 LEErrorCode success = LE_NO_ERROR;
229 return fGlyphStorage.getAuxData(charIndex,success);
230 }
231
232 void decomposeReorderMatras ( const IndicClassTable *classTable, le_int32 beginSyllable, le_int32 nextSyllable, le_int32 inv_count ) {
233 le_int32 i;
234 LEErrorCode success = LE_NO_ERROR;
235
236 for ( i = beginSyllable ; i < nextSyllable ; i++ ) {
237 if ( classTable->isMatra(fOutChars[i+inv_count])) {
238 IndicClassTable::CharClass matraClass = classTable->getCharClass(fOutChars[i+inv_count]);
239 if ( classTable->isSplitMatra(matraClass)) {
240 le_int32 saveIndex = fGlyphStorage.getCharIndex(i+inv_count,success);
241 le_uint32 saveAuxData = fGlyphStorage.getAuxData(i+inv_count,success);
242 const SplitMatra *splitMatra = classTable->getSplitMatra(matraClass);
243 int j;
244 for (j = 0 ; j < SM_MAX_PIECES && *(splitMatra)[j] != 0 ; j++) {
245 LEUnicode piece = (*splitMatra)[j];
246 if ( j == 0 ) {
247 fOutChars[i+inv_count] = piece;
248 matraClass = classTable->getCharClass(piece);
249 } else {
250 insertCharacter(piece,i+1+inv_count,saveIndex,saveAuxData);
251 nextSyllable++;
252 }
253 }
254 }
255
256 if ((matraClass & CF_POS_MASK) == CF_POS_BEFORE) {
257 moveCharacter(i+inv_count,beginSyllable+inv_count);
258 }
259 }
260 }
261 }
262
263 void moveCharacter( le_int32 fromPosition, le_int32 toPosition ) {
264 le_int32 i,saveIndex;
265 le_uint32 saveAuxData;
266 LEUnicode saveChar = fOutChars[fromPosition];
267 LEErrorCode success = LE_NO_ERROR;
268 LEErrorCode success2 = LE_NO_ERROR;
269 saveIndex = fGlyphStorage.getCharIndex(fromPosition,success);
270 saveAuxData = fGlyphStorage.getAuxData(fromPosition,success);
271
272 if ( fromPosition > toPosition ) {
273 for ( i = fromPosition ; i > toPosition ; i-- ) {
274 fOutChars[i] = fOutChars[i-1];
275 fGlyphStorage.setCharIndex(i,fGlyphStorage.getCharIndex(i-1,success2),success);
276 fGlyphStorage.setAuxData(i,fGlyphStorage.getAuxData(i-1,success2), success);
277
278 }
279 } else {
280 for ( i = fromPosition ; i < toPosition ; i++ ) {
281 fOutChars[i] = fOutChars[i+1];
282 fGlyphStorage.setCharIndex(i,fGlyphStorage.getCharIndex(i+1,success2),success);
283 fGlyphStorage.setAuxData(i,fGlyphStorage.getAuxData(i+1,success2), success);
284 }
285
286 }
287 fOutChars[toPosition] = saveChar;
288 fGlyphStorage.setCharIndex(toPosition,saveIndex,success);
289 fGlyphStorage.setAuxData(toPosition,saveAuxData,success);
290
291 }
292 void insertCharacter( LEUnicode ch, le_int32 toPosition, le_int32 charIndex, le_uint32 auxData ) {
293 LEErrorCode success = LE_NO_ERROR;
294 le_int32 i;
295 fOutIndex += 1;
296
297 for ( i = fOutIndex ; i > toPosition ; i--) {
298 fOutChars[i] = fOutChars[i-1];
299 fGlyphStorage.setCharIndex(i,fGlyphStorage.getCharIndex(i-1,success),success);
300 fGlyphStorage.setAuxData(i,fGlyphStorage.getAuxData(i-1,success), success);
301 }
302
303 fOutChars[toPosition] = ch;
304 fGlyphStorage.setCharIndex(toPosition,charIndex,success);
305 fGlyphStorage.setAuxData(toPosition,auxData,success);
306
307 }
308 void removeCharacter( le_int32 fromPosition ) {
309 LEErrorCode success = LE_NO_ERROR;
310 le_int32 i;
311 fOutIndex -= 1;
312
313 for ( i = fromPosition ; i < fOutIndex ; i--) {
314 fOutChars[i] = fOutChars[i+1];
315 fGlyphStorage.setCharIndex(i,fGlyphStorage.getCharIndex(i+1,success),success);
316 fGlyphStorage.setAuxData(i,fGlyphStorage.getAuxData(i+1,success), success);
317 }
318 }
319
320 le_bool noteMatra(const IndicClassTable *classTable, LEUnicode matra, le_uint32 matraIndex, FeatureMask matraFeatures, le_bool wordStart)
321 {
322 IndicClassTable::CharClass matraClass = classTable->getCharClass(matra);
323
324 fMatraFeatures = matraFeatures;
325
326 if (wordStart) {
327 fMatraFeatures |= initFeatureMask;
328 }
329
330 if (IndicClassTable::isMatra(matraClass)) {
331 if (IndicClassTable::isSplitMatra(matraClass)) {
332 const SplitMatra *splitMatra = classTable->getSplitMatra(matraClass);
333 int i;
334
335 for (i = 0; i < SM_MAX_PIECES && (*splitMatra)[i] != 0; i += 1) {
336 LEUnicode piece = (*splitMatra)[i];
337 IndicClassTable::CharClass pieceClass = classTable->getCharClass(piece);
338
339 saveMatra(piece, matraIndex, pieceClass);
340 }
341 } else {
342 saveMatra(matra, matraIndex, matraClass);
343 }
344
345 return TRUE;
346 }
347
348 return FALSE;
349 }
350
351 void noteVowelModifier(const IndicClassTable *classTable, LEUnicode vowelModifier, le_uint32 vowelModifierIndex, FeatureMask vowelModifierFeatures)
352 {
353 IndicClassTable::CharClass vmClass = classTable->getCharClass(vowelModifier);
354
355 fVMIndex = vowelModifierIndex;
356 fVMFeatures = vowelModifierFeatures;
357
358 if (IndicClassTable::isVowelModifier(vmClass)) {
359 switch (vmClass & CF_POS_MASK) {
360 case CF_POS_ABOVE:
361 fVMabove = vowelModifier;
362 break;
363
364 case CF_POS_AFTER:
365 fVMpost = vowelModifier;
366 break;
367
368 default:
369 // FIXME: this is an error...
370 break;
371 }
372 }
373 }
374
375 void noteStressMark(const IndicClassTable *classTable, LEUnicode stressMark, le_uint32 stressMarkIndex, FeatureMask stressMarkFeatures)
376 {
377 IndicClassTable::CharClass smClass = classTable->getCharClass(stressMark);
378
379 fSMIndex = stressMarkIndex;
380 fSMFeatures = stressMarkFeatures;
381
382 if (IndicClassTable::isStressMark(smClass)) {
383 switch (smClass & CF_POS_MASK) {
384 case CF_POS_ABOVE:
385 fSMabove = stressMark;
386 break;
387
388 case CF_POS_BELOW:
389 fSMbelow = stressMark;
390 break;
391
392 default:
393 // FIXME: this is an error...
394 break;
395 }
396 }
397 }
398
399 void notePreBaseConsonant(le_uint32 index,LEUnicode PBConsonant, LEUnicode PBVirama, FeatureMask features)
400 {
401 fPBCIndex = index;
402 fPreBaseConsonant = PBConsonant;
403 fPreBaseVirama = PBVirama;
404 fPBCFeatures = features;
405 }
406
407 void noteBaseConsonant()
408 {
409 if (fMPreFixups != NULL && fMPreOutIndex >= 0) {
410 fMPreFixups->add(fOutIndex, fMPreOutIndex);
411 }
412 }
413
414 // Handles Al-Lakuna in Sinhala split vowels.
415 void writeAlLakuna()
416 {
417 if (fAlLakuna != 0) {
418 writeChar(fAlLakuna, fAlLakunaIndex, fMatraFeatures);
419 }
420 }
421
422 void writeMpre()
423 {
424 if (fMpre != 0) {
425 fMPreOutIndex = fOutIndex;
426 writeChar(fMpre, fMpreIndex, fMatraFeatures);
427 }
428 }
429
430 void writeMbelow()
431 {
432 if (fMbelow != 0) {
433 writeChar(fMbelow, fMbelowIndex, fMatraFeatures);
434 }
435 }
436
437 void writeMabove()
438 {
439 if (fMabove != 0) {
440 writeChar(fMabove, fMaboveIndex, fMatraFeatures);
441 }
442 }
443
444 void writeMpost()
445 {
446 if (fMpost != 0) {
447 writeChar(fMpost, fMpostIndex, fMatraFeatures);
448 }
449 }
450
451 void writeLengthMark()
452 {
453 if (fLengthMark != 0) {
454 writeChar(fLengthMark, fLengthMarkIndex, fMatraFeatures);
455 }
456 }
457
458 void writeVMabove()
459 {
460 if (fVMabove != 0) {
461 writeChar(fVMabove, fVMIndex, fVMFeatures);
462 }
463 }
464
465 void writeVMpost()
466 {
467 if (fVMpost != 0) {
468 writeChar(fVMpost, fVMIndex, fVMFeatures);
469 }
470 }
471
472 void writeSMabove()
473 {
474 if (fSMabove != 0) {
475 writeChar(fSMabove, fSMIndex, fSMFeatures);
476 }
477 }
478
479 void writeSMbelow()
480 {
481 if (fSMbelow != 0) {
482 writeChar(fSMbelow, fSMIndex, fSMFeatures);
483 }
484 }
485
486 void writePreBaseConsonant()
487 {
488 // The TDIL spec says that consonant + virama + RRA should produce a rakar in Malayalam. However,
489 // it seems that almost none of the fonts for Malayalam are set up to handle this.
490 // So, we're going to force the issue here by using the rakar as defined with RA in most fonts.
491
492 if (fPreBaseConsonant == 0x0d31) { // RRA
493 fPreBaseConsonant = 0x0d30; // RA
494 }
495
496 if (fPreBaseConsonant != 0) {
497 writeChar(fPreBaseConsonant, fPBCIndex, fPBCFeatures);
498 writeChar(fPreBaseVirama,fPBCIndex-1,fPBCFeatures);
499 }
500 }
501
502 le_int32 getOutputIndex()
503 {
504 return fOutIndex;
505 }
506 };
507
508
509
510 // TODO: Find better names for these!
511 #define tagArray4 (loclFeatureMask | nuktFeatureMask | akhnFeatureMask | vatuFeatureMask | presFeatureMask | blwsFeatureMask | abvsFeatureMask | pstsFeatureMask | halnFeatureMask | blwmFeatureMask | abvmFeatureMask | distFeatureMask)
512 #define tagArray3 (pstfFeatureMask | tagArray4)
513 #define tagArray2 (halfFeatureMask | tagArray3)
514 #define tagArray1 (blwfFeatureMask | tagArray2)
515 #define tagArray0 (rphfFeatureMask | tagArray1)
516
517 static const FeatureMap featureMap[] = {
518 {loclFeatureTag, loclFeatureMask},
519 {initFeatureTag, initFeatureMask},
520 {nuktFeatureTag, nuktFeatureMask},
521 {akhnFeatureTag, akhnFeatureMask},
522 {rphfFeatureTag, rphfFeatureMask},
523 {blwfFeatureTag, blwfFeatureMask},
524 {halfFeatureTag, halfFeatureMask},
525 {pstfFeatureTag, pstfFeatureMask},
526 {vatuFeatureTag, vatuFeatureMask},
527 {presFeatureTag, presFeatureMask},
528 {blwsFeatureTag, blwsFeatureMask},
529 {abvsFeatureTag, abvsFeatureMask},
530 {pstsFeatureTag, pstsFeatureMask},
531 {halnFeatureTag, halnFeatureMask},
532 {blwmFeatureTag, blwmFeatureMask},
533 {abvmFeatureTag, abvmFeatureMask},
534 {distFeatureTag, distFeatureMask}
535 };
536
537 static const le_int32 featureCount = LE_ARRAY_SIZE(featureMap);
538
539 static const FeatureMap v2FeatureMap[] = {
540 {loclFeatureTag, loclFeatureMask},
541 {nuktFeatureTag, nuktFeatureMask},
542 {akhnFeatureTag, akhnFeatureMask},
543 {rphfFeatureTag, rphfFeatureMask},
544 {rkrfFeatureTag, rkrfFeatureMask},
545 {blwfFeatureTag, blwfFeatureMask},
546 {halfFeatureTag, halfFeatureMask},
547 {vatuFeatureTag, vatuFeatureMask},
548 {cjctFeatureTag, cjctFeatureMask},
549 {presFeatureTag, presFeatureMask},
550 {abvsFeatureTag, abvsFeatureMask},
551 {blwsFeatureTag, blwsFeatureMask},
552 {pstsFeatureTag, pstsFeatureMask},
553 {halnFeatureTag, halnFeatureMask},
554 {caltFeatureTag, caltFeatureMask},
555 {kernFeatureTag, kernFeatureMask},
556 {distFeatureTag, distFeatureMask},
557 {abvmFeatureTag, abvmFeatureMask},
558 {blwmFeatureTag, blwmFeatureMask}
559 };
560
561 static const le_int32 v2FeatureMapCount = LE_ARRAY_SIZE(v2FeatureMap);
562
563 static const le_int8 stateTable[][CC_COUNT] =
564 {
565 // xx vm sm iv i2 i3 ct cn nu dv s1 s2 s3 vr zw al
566 { 1, 6, 1, 5, 8, 11, 3, 2, 1, 5, 9, 5, 5, 1, 1, 1}, // 0 - ground state
567 {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, // 1 - exit state
568 {-1, 6, 1, -1, -1, -1, -1, -1, -1, 5, 9, 5, 5, 4, 12, -1}, // 2 - consonant with nukta
569 {-1, 6, 1, -1, -1, -1, -1, -1, 2, 5, 9, 5, 5, 4, 12, 13}, // 3 - consonant
570 {-1, -1, -1, -1, -1, -1, 3, 2, -1, -1, -1, -1, -1, -1, 7, -1}, // 4 - consonant virama
571 {-1, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, // 5 - dependent vowels
572 {-1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, // 6 - vowel mark
573 {-1, -1, -1, -1, -1, -1, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1}, // 7 - consonant virama ZWJ, consonant ZWJ virama
574 {-1, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 4, -1, -1}, // 8 - independent vowels that can take a virama
575 {-1, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 5, -1, -1, -1}, // 9 - first part of split vowel
576 {-1, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 5, -1, -1, -1}, // 10 - second part of split vowel
577 {-1, 6, 1, -1, -1, -1, -1, -1, -1, 5, 9, 5, 5, 4, -1, -1}, // 11 - independent vowels that can take an iv
578 {-1, -1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 7, -1, 7}, // 12 - consonant ZWJ (TODO: Take everything else that can be after a consonant?)
579 {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 7, -1} // 13 - consonant al-lakuna ZWJ consonant
580 };
581
582
583 const FeatureMap *IndicReordering::getFeatureMap(le_int32 &count)
584 {
585 count = featureCount;
586
587 return featureMap;
588 }
589
590 const FeatureMap *IndicReordering::getv2FeatureMap(le_int32 &count)
591 {
592 count = v2FeatureMapCount;
593
594 return v2FeatureMap;
595 }
596
597 le_int32 IndicReordering::findSyllable(const IndicClassTable *classTable, const LEUnicode *chars, le_int32 prev, le_int32 charCount)
598 {
599 le_int32 cursor = prev;
600 le_int8 state = 0;
601 le_int8 consonant_count = 0;
602
603 while (cursor < charCount) {
604 IndicClassTable::CharClass charClass = classTable->getCharClass(chars[cursor]);
605
606 if ( IndicClassTable::isConsonant(charClass) ) {
607 consonant_count++;
608 if ( consonant_count > MAX_CONSONANTS_PER_SYLLABLE ) {
609 break;
610 }
611 }
612
613 state = stateTable[state][charClass & CF_CLASS_MASK];
614
615 if (state < 0) {
616 break;
617 }
618
619 cursor += 1;
620 }
621
622 return cursor;
623 }
624
625 le_int32 IndicReordering::reorder(const LEUnicode *chars, le_int32 charCount, le_int32 scriptCode,
626 LEUnicode *outChars, LEGlyphStorage &glyphStorage,
627 MPreFixups **outMPreFixups, LEErrorCode& success)
628 {
629 if (LE_FAILURE(success)) {
630 return 0;
631 }
632
633 MPreFixups *mpreFixups = NULL;
634 const IndicClassTable *classTable = IndicClassTable::getScriptClassTable(scriptCode);
635
636 if (classTable->scriptFlags & SF_MPRE_FIXUP) {
637 mpreFixups = new MPreFixups(charCount);
638 if (mpreFixups == NULL) {
639 success = LE_MEMORY_ALLOCATION_ERROR;
640 return 0;
641 }
642 }
643
644 IndicReorderingOutput output(outChars, glyphStorage, mpreFixups);
645 le_int32 i, prev = 0;
646 le_bool lastInWord = FALSE;
647
648 while (prev < charCount) {
649 le_int32 syllable = findSyllable(classTable, chars, prev, charCount);
650 le_int32 matra, markStart = syllable;
651
652 output.reset();
653
654 if (classTable->isStressMark(chars[markStart - 1])) {
655 markStart -= 1;
656 output.noteStressMark(classTable, chars[markStart], markStart, tagArray1);
657 }
658
659 if (markStart != prev && classTable->isVowelModifier(chars[markStart - 1])) {
660 markStart -= 1;
661 output.noteVowelModifier(classTable, chars[markStart], markStart, tagArray1);
662 }
663
664 matra = markStart - 1;
665
666 while (output.noteMatra(classTable, chars[matra], matra, tagArray1, !lastInWord) && matra != prev) {
667 matra -= 1;
668 }
669
670 lastInWord = TRUE;
671
672 switch (classTable->getCharClass(chars[prev]) & CF_CLASS_MASK) {
673 case CC_RESERVED:
674 lastInWord = FALSE;
675 /* fall through */
676
677 case CC_INDEPENDENT_VOWEL:
678 case CC_ZERO_WIDTH_MARK:
679 for (i = prev; i < syllable; i += 1) {
680 output.writeChar(chars[i], i, tagArray1);
681 }
682
683 break;
684
685 case CC_AL_LAKUNA:
686 case CC_NUKTA:
687 output.writeChar(C_DOTTED_CIRCLE, prev, tagArray1);
688 output.writeChar(chars[prev], prev, tagArray1);
689 break;
690
691 case CC_VIRAMA:
692 // A lone virama is illegal unless it follows a
693 // MALAYALAM_VOWEL_SIGN_U. Such a usage is called
694 // "samvruthokaram".
695 if (chars[prev - 1] != C_MALAYALAM_VOWEL_SIGN_U) {
696 output.writeChar(C_DOTTED_CIRCLE, prev, tagArray1);
697 }
698
699 output.writeChar(chars[prev], prev, tagArray1);
700 break;
701
702 case CC_DEPENDENT_VOWEL:
703 case CC_SPLIT_VOWEL_PIECE_1:
704 case CC_SPLIT_VOWEL_PIECE_2:
705 case CC_SPLIT_VOWEL_PIECE_3:
706 case CC_VOWEL_MODIFIER:
707 case CC_STRESS_MARK:
708 output.writeMpre();
709
710 output.writeChar(C_DOTTED_CIRCLE, prev, tagArray1);
711
712 output.writeMbelow();
713 output.writeSMbelow();
714 output.writeMabove();
715
716 if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) != 0) {
717 output.writeMpost();
718 }
719
720 if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) != 0) {
721 output.writeVMabove();
722 output.writeSMabove(); // FIXME: there are no SM's in these scripts...
723 }
724
725 if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) {
726 output.writeMpost();
727 }
728
729 output.writeLengthMark();
730 output.writeAlLakuna();
731
732 if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) == 0) {
733 output.writeVMabove();
734 output.writeSMabove();
735 }
736
737 output.writeVMpost();
738 break;
739
740 case CC_INDEPENDENT_VOWEL_2:
741 case CC_INDEPENDENT_VOWEL_3:
742 case CC_CONSONANT:
743 case CC_CONSONANT_WITH_NUKTA:
744 {
745 le_uint32 length = markStart - prev;
746 le_int32 lastConsonant = markStart - 1;
747 le_int32 baseLimit = prev;
748
749 // Check for REPH at front of syllable
750 if (length > 2 && classTable->isReph(chars[prev]) && classTable->isVirama(chars[prev + 1]) && chars[prev + 2] != C_SIGN_ZWNJ) {
751 baseLimit += 2;
752
753 // Check for eyelash RA, if the script supports it
754 if ((classTable->scriptFlags & SF_EYELASH_RA) != 0 &&
755 chars[baseLimit] == C_SIGN_ZWJ) {
756 if (length > 3) {
757 baseLimit += 1;
758 } else {
759 baseLimit -= 2;
760 }
761 }
762 }
763
764 while (lastConsonant > baseLimit && !classTable->isConsonant(chars[lastConsonant])) {
765 lastConsonant -= 1;
766 }
767
768
769 IndicClassTable::CharClass charClass = CC_RESERVED;
770 IndicClassTable::CharClass nextClass = CC_RESERVED;
771 le_int32 baseConsonant = lastConsonant;
772 le_int32 postBase = lastConsonant + 1;
773 le_int32 postBaseLimit = classTable->scriptFlags & SF_POST_BASE_LIMIT_MASK;
774 le_bool seenVattu = FALSE;
775 le_bool seenBelowBaseForm = FALSE;
776 le_bool seenPreBaseForm = FALSE;
777 le_bool hasNukta = FALSE;
778 le_bool hasBelowBaseForm = FALSE;
779 le_bool hasPostBaseForm = FALSE;
780 le_bool hasPreBaseForm = FALSE;
781
782 if (postBase < markStart && classTable->isNukta(chars[postBase])) {
783 charClass = CC_NUKTA;
784 postBase += 1;
785 }
786
787 while (baseConsonant > baseLimit) {
788 nextClass = charClass;
789 hasNukta = IndicClassTable::isNukta(nextClass);
790 charClass = classTable->getCharClass(chars[baseConsonant]);
791
792 hasBelowBaseForm = IndicClassTable::hasBelowBaseForm(charClass) && !hasNukta;
793 hasPostBaseForm = IndicClassTable::hasPostBaseForm(charClass) && !hasNukta;
794 hasPreBaseForm = IndicClassTable::hasPreBaseForm(charClass) && !hasNukta;
795
796 if (IndicClassTable::isConsonant(charClass)) {
797 if (postBaseLimit == 0 || seenVattu ||
798 (baseConsonant > baseLimit && !classTable->isVirama(chars[baseConsonant - 1])) ||
799 !(hasBelowBaseForm || hasPostBaseForm || hasPreBaseForm)) {
800 break;
801 }
802
803 // Note any pre-base consonants
804 if ( baseConsonant == lastConsonant && lastConsonant > 0 &&
805 hasPreBaseForm && classTable->isVirama(chars[baseConsonant - 1])) {
806 output.notePreBaseConsonant(lastConsonant,chars[lastConsonant],chars[lastConsonant-1],tagArray2);
807 seenPreBaseForm = TRUE;
808
809 }
810 // consonants with nuktas are never vattus
811 seenVattu = IndicClassTable::isVattu(charClass) && !hasNukta;
812
813 // consonants with nuktas never have below- or post-base forms
814 if (hasPostBaseForm) {
815 if (seenBelowBaseForm) {
816 break;
817 }
818
819 postBase = baseConsonant;
820 } else if (hasBelowBaseForm) {
821 seenBelowBaseForm = TRUE;
822 }
823
824 postBaseLimit -= 1;
825 }
826
827 baseConsonant -= 1;
828 }
829
830 // Write Mpre
831 output.writeMpre();
832
833 // Write eyelash RA
834 // NOTE: baseLimit == prev + 3 iff eyelash RA present...
835 if (baseLimit == prev + 3) {
836 output.writeChar(chars[prev], prev, tagArray2);
837 output.writeChar(chars[prev + 1], prev + 1, tagArray2);
838 output.writeChar(chars[prev + 2], prev + 2, tagArray2);
839 }
840
841 // write any pre-base consonants
842 output.writePreBaseConsonant();
843
844 le_bool supressVattu = TRUE;
845
846 for (i = baseLimit; i < baseConsonant; i += 1) {
847 LEUnicode ch = chars[i];
848 // Don't put 'pstf' or 'blwf' on anything before the base consonant.
849 FeatureMask features = tagArray1 & ~( pstfFeatureMask | blwfFeatureMask );
850
851 charClass = classTable->getCharClass(ch);
852 nextClass = classTable->getCharClass(chars[i + 1]);
853 hasNukta = IndicClassTable::isNukta(nextClass);
854
855 if (IndicClassTable::isConsonant(charClass)) {
856 if (IndicClassTable::isVattu(charClass) && !hasNukta && supressVattu) {
857 features = tagArray4;
858 }
859
860 supressVattu = IndicClassTable::isVattu(charClass) && !hasNukta;
861 } else if (IndicClassTable::isVirama(charClass) && chars[i + 1] == C_SIGN_ZWNJ)
862 {
863 features = tagArray4;
864 }
865
866 output.writeChar(ch, i, features);
867 }
868
869 le_int32 bcSpan = baseConsonant + 1;
870
871 if (bcSpan < markStart && classTable->isNukta(chars[bcSpan])) {
872 bcSpan += 1;
873 }
874
875 if (baseConsonant == lastConsonant && bcSpan < markStart &&
876 (classTable->isVirama(chars[bcSpan]) || classTable->isAlLakuna(chars[bcSpan]))) {
877 bcSpan += 1;
878
879 if (bcSpan < markStart && chars[bcSpan] == C_SIGN_ZWNJ) {
880 bcSpan += 1;
881 }
882 }
883
884 // note the base consonant for post-GSUB fixups
885 output.noteBaseConsonant();
886
887 // write base consonant
888 for (i = baseConsonant; i < bcSpan; i += 1) {
889 output.writeChar(chars[i], i, tagArray4);
890 }
891
892 if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) != 0) {
893 output.writeMbelow();
894 output.writeSMbelow(); // FIXME: there are no SMs in these scripts...
895 output.writeMabove();
896 output.writeMpost();
897 }
898
899 // write below-base consonants
900 if (baseConsonant != lastConsonant && !seenPreBaseForm) {
901 for (i = bcSpan + 1; i < postBase; i += 1) {
902 output.writeChar(chars[i], i, tagArray1);
903 }
904
905 if (postBase > lastConsonant) {
906 // write halant that was after base consonant
907 output.writeChar(chars[bcSpan], bcSpan, tagArray1);
908 }
909 }
910
911 // write Mbelow, SMbelow, Mabove
912 if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) {
913 output.writeMbelow();
914 output.writeSMbelow();
915 output.writeMabove();
916 }
917
918 if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) != 0) {
919 if (baseLimit == prev + 2) {
920 output.writeChar(chars[prev], prev, tagArray0);
921 output.writeChar(chars[prev + 1], prev + 1, tagArray0);
922 }
923
924 output.writeVMabove();
925 output.writeSMabove(); // FIXME: there are no SM's in these scripts...
926 }
927
928 // write post-base consonants
929 // FIXME: does this put the right tags on post-base consonants?
930 if (baseConsonant != lastConsonant && !seenPreBaseForm) {
931 if (postBase <= lastConsonant) {
932 for (i = postBase; i <= lastConsonant; i += 1) {
933 output.writeChar(chars[i], i, tagArray3);
934 }
935
936 // write halant that was after base consonant
937 output.writeChar(chars[bcSpan], bcSpan, tagArray1);
938 }
939
940 // write the training halant, if there is one
941 if (lastConsonant < matra && classTable->isVirama(chars[matra])) {
942 output.writeChar(chars[matra], matra, tagArray4);
943 }
944 }
945
946 // write Mpost
947 if ((classTable->scriptFlags & SF_MATRAS_AFTER_BASE) == 0) {
948 output.writeMpost();
949 }
950
951 output.writeLengthMark();
952 output.writeAlLakuna();
953
954 // write reph
955 if ((classTable->scriptFlags & SF_REPH_AFTER_BELOW) == 0) {
956 if (baseLimit == prev + 2) {
957 output.writeChar(chars[prev], prev, tagArray0);
958 output.writeChar(chars[prev + 1], prev + 1, tagArray0);
959 }
960
961 output.writeVMabove();
962 output.writeSMabove();
963 }
964
965 output.writeVMpost();
966
967 break;
968 }
969
970 default:
971 break;
972 }
973
974 prev = syllable;
975 }
976
977 *outMPreFixups = mpreFixups;
978
979 return output.getOutputIndex();
980 }
981
982 void IndicReordering::adjustMPres(MPreFixups *mpreFixups, LEGlyphStorage &glyphStorage, LEErrorCode& success)
983 {
984 if (mpreFixups != NULL) {
985 mpreFixups->apply(glyphStorage, success);
986
987 delete mpreFixups;
988 }
989 }
990
991 void IndicReordering::applyPresentationForms(LEGlyphStorage &glyphStorage, le_int32 count)
992 {
993 LEErrorCode success = LE_NO_ERROR;
994
995 // This sets us up for 2nd pass of glyph substitution as well as setting the feature masks for the
996 // GPOS table lookups
997
998 for ( le_int32 i = 0 ; i < count ; i++ ) {
999 glyphStorage.setAuxData(i, ( presentationFormsMask | positioningFormsMask ), success);
1000 }
1001
1002 }
1003 void IndicReordering::finalReordering(LEGlyphStorage &glyphStorage, le_int32 count)
1004 {
1005 LEErrorCode success = LE_NO_ERROR;
1006
1007 // Reposition REPH as appropriate
1008
1009 for ( le_int32 i = 0 ; i < count ; i++ ) {
1010
1011 le_int32 tmpAuxData = glyphStorage.getAuxData(i,success);
1012 LEGlyphID tmpGlyph = glyphStorage.getGlyphID(i,success);
1013
1014 if ( ( tmpGlyph != NO_GLYPH ) && (tmpAuxData & rephConsonantMask) && !(tmpAuxData & repositionedGlyphMask)) {
1015
1016 le_bool targetPositionFound = false;
1017 le_int32 targetPosition = i+1;
1018 le_int32 baseConsonantData;
1019
1020 while (!targetPositionFound) {
1021 tmpGlyph = glyphStorage.getGlyphID(targetPosition,success);
1022 tmpAuxData = glyphStorage.getAuxData(targetPosition,success);
1023
1024 if ( tmpAuxData & baseConsonantMask ) {
1025 baseConsonantData = tmpAuxData;
1026 targetPositionFound = true;
1027 } else {
1028 targetPosition++;
1029 }
1030 }
1031
1032 // Make sure we are not putting the reph into an empty hole
1033
1034 le_bool targetPositionHasGlyph = false;
1035 while (!targetPositionHasGlyph) {
1036 tmpGlyph = glyphStorage.getGlyphID(targetPosition,success);
1037 if ( tmpGlyph != NO_GLYPH ) {
1038 targetPositionHasGlyph = true;
1039 } else {
1040 targetPosition--;
1041 }
1042 }
1043
1044 // Make sure that REPH is positioned after any above base or post base matras
1045 //
1046 le_bool checkMatraDone = false;
1047 le_int32 checkMatraPosition = targetPosition+1;
1048 while ( !checkMatraDone ) {
1049 tmpAuxData = glyphStorage.getAuxData(checkMatraPosition,success);
1050 if ( checkMatraPosition >= count || ( (tmpAuxData ^ baseConsonantData) & LE_GLYPH_GROUP_MASK)) {
1051 checkMatraDone = true;
1052 continue;
1053 }
1054 if ( (tmpAuxData & matraMask) &&
1055 (((tmpAuxData & markPositionMask) == aboveBasePosition) ||
1056 ((tmpAuxData & markPositionMask) == postBasePosition))) {
1057 targetPosition = checkMatraPosition;
1058 }
1059 checkMatraPosition++;
1060 }
1061
1062 glyphStorage.moveGlyph(i,targetPosition,repositionedGlyphMask);
1063 }
1064 }
1065 }
1066
1067
1068 le_int32 IndicReordering::v2process(const LEUnicode *chars, le_int32 charCount, le_int32 scriptCode,
1069 LEUnicode *outChars, LEGlyphStorage &glyphStorage)
1070 {
1071 const IndicClassTable *classTable = IndicClassTable::getScriptClassTable(scriptCode);
1072
1073 DynamicProperties dynProps[INDIC_BLOCK_SIZE];
1074 IndicReordering::getDynamicProperties(dynProps,classTable);
1075
1076 IndicReorderingOutput output(outChars, glyphStorage, NULL);
1077 le_int32 i, firstConsonant, baseConsonant, secondConsonant, inv_count = 0, beginSyllable = 0;
1078 //le_bool lastInWord = FALSE;
1079
1080 while (beginSyllable < charCount) {
1081 le_int32 nextSyllable = findSyllable(classTable, chars, beginSyllable, charCount);
1082
1083 output.reset();
1084
1085 // Find the First Consonant
1086 for ( firstConsonant = beginSyllable ; firstConsonant < nextSyllable ; firstConsonant++ ) {
1087 if ( classTable->isConsonant(chars[firstConsonant]) ) {
1088 break;
1089 }
1090 }
1091
1092 // Find the base consonant
1093
1094 baseConsonant = nextSyllable - 1;
1095 secondConsonant = firstConsonant;
1096
1097 // TODO: Use Dynamic Properties for hasBelowBaseForm and hasPostBaseForm()
1098
1099 while ( baseConsonant > firstConsonant ) {
1100 if ( classTable->isConsonant(chars[baseConsonant]) &&
1101 !classTable->hasBelowBaseForm(chars[baseConsonant]) &&
1102 !classTable->hasPostBaseForm(chars[baseConsonant]) ) {
1103 break;
1104 }
1105 else {
1106 if ( classTable->isConsonant(chars[baseConsonant]) ) {
1107 secondConsonant = baseConsonant;
1108 }
1109 baseConsonant--;
1110 }
1111 }
1112
1113 // If the syllable starts with Ra + Halant ( in a script that has Reph ) and has more than one
1114 // consonant, Ra is excluced from candidates for base consonants
1115
1116 if ( classTable->isReph(chars[beginSyllable]) &&
1117 beginSyllable+1 < nextSyllable && classTable->isVirama(chars[beginSyllable+1]) &&
1118 secondConsonant != firstConsonant) {
1119 baseConsonant = secondConsonant;
1120 }
1121
1122 // Populate the output
1123 for ( i = beginSyllable ; i < nextSyllable ; i++ ) {
1124
1125 // Handle invalid combinartions
1126
1127 if ( classTable->isVirama(chars[beginSyllable]) ||
1128 classTable->isMatra(chars[beginSyllable]) ||
1129 classTable->isVowelModifier(chars[beginSyllable]) ||
1130 classTable->isNukta(chars[beginSyllable]) ) {
1131 output.writeChar(C_DOTTED_CIRCLE,beginSyllable,basicShapingFormsMask);
1132 inv_count++;
1133 }
1134 output.writeChar(chars[i],i, basicShapingFormsMask);
1135
1136 }
1137
1138 // Adjust features and set syllable structure bits
1139
1140 for ( i = beginSyllable ; i < nextSyllable ; i++ ) {
1141
1142 FeatureMask outMask = output.getFeatures(i+inv_count);
1143 FeatureMask saveMask = outMask;
1144
1145 // Since reph can only validly occur at the beginning of a syllable
1146 // We only apply it to the first 2 characters in the syllable, to keep it from
1147 // conflicting with other features ( i.e. rkrf )
1148
1149 // TODO : Use the dynamic property for determining isREPH
1150 if ( i == beginSyllable && i < baseConsonant && classTable->isReph(chars[i]) &&
1151 i+1 < nextSyllable && classTable->isVirama(chars[i+1])) {
1152 outMask |= rphfFeatureMask;
1153 outMask |= rephConsonantMask;
1154 output.setFeatures(i+1+inv_count,outMask);
1155
1156 }
1157
1158 if ( i == baseConsonant ) {
1159 outMask |= baseConsonantMask;
1160 }
1161
1162 if ( classTable->isMatra(chars[i])) {
1163 outMask |= matraMask;
1164 if ( classTable->hasAboveBaseForm(chars[i])) {
1165 outMask |= aboveBasePosition;
1166 } else if ( classTable->hasBelowBaseForm(chars[i])) {
1167 outMask |= belowBasePosition;
1168 }
1169 }
1170
1171 // Don't apply half form to virama that stands alone at the end of a syllable
1172 // to prevent half forms from forming when syllable ends with virama
1173
1174 if ( classTable->isVirama(chars[i]) && (i+1 == nextSyllable) ) {
1175 outMask ^= halfFeatureMask;
1176 if ( classTable->isConsonant(chars[i-1]) ) {
1177 FeatureMask tmp = output.getFeatures(i-1+inv_count);
1178 tmp ^= halfFeatureMask;
1179 output.setFeatures(i-1+inv_count,tmp);
1180 }
1181 }
1182
1183 if ( outMask != saveMask ) {
1184 output.setFeatures(i+inv_count,outMask);
1185 }
1186 }
1187
1188 output.decomposeReorderMatras(classTable,beginSyllable,nextSyllable,inv_count);
1189
1190 beginSyllable = nextSyllable;
1191 }
1192
1193
1194 return output.getOutputIndex();
1195 }
1196
1197
1198 void IndicReordering::getDynamicProperties( DynamicProperties *, const IndicClassTable *classTable ) {
1199
1200
1201 LEUnicode currentChar;
1202 LEUnicode workChars[2];
1203 LEGlyphStorage workGlyphs;
1204
1205 IndicReorderingOutput workOutput(workChars, workGlyphs, NULL);
1206
1207 //le_int32 offset = 0;
1208
1209 #if 0
1210 // TODO: Should this section of code have actually been doing something?
1211 // First find the relevant virama for the script we are dealing with
1212 LEUnicode virama;
1213 for ( currentChar = classTable->firstChar ; currentChar <= classTable->lastChar ; currentChar++ ) {
1214 if ( classTable->isVirama(currentChar)) {
1215 virama = currentChar;
1216 break;
1217 }
1218 }
1219 #endif
1220
1221 for ( currentChar = classTable->firstChar ; currentChar <= classTable->lastChar ; currentChar++ ) {
1222 if ( classTable->isConsonant(currentChar)) {
1223 workOutput.reset();
1224 }
1225 }
1226
1227
1228 }
1229
1230 U_NAMESPACE_END
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